What is a Sole Trader? 

In the UK, a sole trader is someone who runs a business in their own name, without creating a separate legal entity. This means that you and your business are the same thing legally, and there’s no separation between personal and business finances or responsibilities. As a sole trader, you keep all of your business’ profits after tax, make all decisions about pricing, work, and clients, and report your earnings to HMRC by submitting an annual Self-Assessment Tax Return. It also means that you’re personally responsible for any business debts or liabilities.

This structure is the most common way to start self-employment in the UK because it’s simple, flexible and doesn’t cost a lot to set up. You don’t need to register with Companies House, appoint directors or manage shares, which you do need to manage as a limited company director. Instead, you just register as self-employed with HMRC and start working.

Are Sole Traders, Freelancers and Contractors the Same?

The terms sole trader, freelancer and contractor are often used interchangeably, but they are slightly different. Being a sole trader is a legal structure, it’s how your business is recognised for tax and legal purposes. Being a freelancer is a style of working, and it usually means working independently for multiple clients, often on short-term or project-based work. Being a contractor is a type of professional engagement, as contractors typically work on defined, long-term contracts. 

This means you can be a combination of all three. You might be a freelancer operating as a sole trader, or a contractor operating as a sole trader. You might be a contractor operating through a limited company, or a freelancer working through an agency.

A lot of people who begin contracting choose to be sole traders at first because it’s quick to set up and easy to manage. But in some sectors - particularly those affected by IR35 rules - switching and operating through a limited company becomes a common route later on.

How to Register as a Sole Trader

Registering as a sole trader in the UK is simple, but there are specific rules and deadlines you need to follow. You must register as self-employed if you earn more than £1,000 in a tax year from self-employment - this is known as the trading allowance - or if you need to prove self-employed status for tax or benefit reasons. You must register by the 5th October following the end of the tax year in which you started trading. For example, if you started working for yourself in June of 2025, which is part of the 2025/2026 tax year, you need to register as a self-employed sole trader by 5 October 2026.

You register online with HMRC for Self Assessment. After registering, you’ll receive a Unique Taxpayer Reference (UTR) and information on how to fill in tax returns. You’ll need to keep records of income and expenses, complete a Self Assessment tax return each year, pay Income Tax on your profits and pay National Insurance Contributions (NICs). If your taxable turnover goes above the VAT threshold - this is currently £90,000 per year - you will need to register for VAT.

What Changes Once You’re Set Up as a Sole Trader

Registering as a sole trader is quick, but the day-to-day realities of being self-employed can really shake things up. It’s likely to be a big change if you’re not used to working for yourself. 

You Become Responsible for Your Own Tax

When you’re employed, Income Tax and NICs are deducted automatically through PAYE. As a sole trader, nothing is deducted unless you do it yourself. This means you need to:

• Track your income, from all of your income sources
• Record allowable expenses
• Calculate profits
• Submit tax returns
• Pay the Income Tax and NICs you owe

For a lot of sole traders, the easiest way to do this is to set aside 20% to 30% of your income - or more, depending on your earnings - in a separate account to cover tax bills.

You May Need to Make Payments on Account

Once your tax bill reaches a certain level, HMRC may require payments on account, which are advance payments towards the next year’s tax. These are usually paid on 31st January and 31st July, and it’s something that catches a lot of new sole traders out. It might take you by surprise, because you may effectively pay tax for the current year and the next year at the same time. This is something you’ll need to account for when you’re putting money aside for your tax.

Record Keeping is Non-Negotiable

HMRC requires you to keep accurate business records, and this is non-negotiable. This includes records relating to sales, invoices, receipts, expenses, bank statements, mileage records and equipment purchases. As well as keeping HMRC happy, this benefits you by helping you to claim all allowable expenses, reduce tax legally, avoid HMRC penalties and see how your business is performing.

You Manage Cash Flow

A lot of sole traders find that their income is irregular; some months you might have cash flowing in, and other months it might slow down. Some clients pay late, contracts end and workloads fluctuate. It’s all part of contracting. To manage this, you need to plan ahead for quiet periods, unexpected costs, tax payments, equipment upgrades and repairs, illness and holidays. To do this, you need to prioritise cash flow management.

You Are Personally Liable for Business Debts

This is one of the most important differences compared to what happens when you set up a limited company. If the business owes money, you owe money. Your personal assets could be at risk if the business can’t meet its obligations. This is why a number of sole traders consider taking out professional indemnity insurance, public liability insurance and income protection.

You’re in Charge of All Business Administration

Being self-employed means more than doing the work your clients have asked you to do. You’re also responsible for finding clients, negotiating contracts, setting your payment rates, marketing, managing your accounts and chasing invoices. You effectively become a finance department, marketing team and operations manager all at once, which is why many sole traders seek the help of an accountant, as a way to lighten the load.

You’ve Navigated Being a Sole Trader: What Comes Next?

For a lot of people in the UK who want to work for themselves, becoming a sole trader is the ideal way to get started. It allows you to test self-employment with minimal complexity and low setup costs, and dip your toe into contracting without having to set up a limited company. But, as your income increases, your client base expands and your work becomes more structured, you might start to think about the next step - setting up a limited company. Though there’s no obligation to set up a limited company, it’s a common next step for sole traders in the UK. 

Why Contractors Move From a Sole Trader to Limited Company 

Many contractors set up a limited company to benefit from limited liability. This means the company becomes legally separate from you, helping to protect personal assets, such as any savings you have in personal bank accounts. There’s also a lot more potential for tax-efficiency when you have a limited company. At higher income levels, paying yourself through salary and dividends may be more tax-efficient.

You might also benefit from increased professional credibility when you set up a limited company, as some clients - especially larger organisations - prefer to work with limited companies. Instead of passing you up for another business, they can work with you, knowing you’ve swapped from being a sole trader to a limited company contractor. There’s a clear separation of finances when you set up a limited company, as you need to start a business bank 

Many successful contractors begin as sole traders, gain experience managing finances and clients, and then set up a limited company once their business reaches a stable and profitable stage. At Go Limited, we encourage sole traders to think about how their working life is changing. When you go from being an employer, to a sole trader, to a limited company director, you move from being paid by an employer to taking full control of how you earn, manage, and grow your income.